<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>w3school页面布局</title>
    <!-- 引入css文件 -->
    <link rel="stylesheet" href="../css/1-div.css">
</head>
<body>
    <div>
        <div id="logo">
            <img src="" alt="">
        </div>
        <div id="menu"">
            <div class="menu-item">HTML/CSS</div>
            <div class="menu-item">Browser Side</div>
            <div class="menu-item">Server Side</div>
            <div class="menu-item"></div>
            <div class="menu-item"></div>
            <div class="menu-item"></div>
            <div class="menu-item"></div>
        </div>
        <div id="body">
            <div id="left" class="show">
                <div id="head"></div>
                <div id="footer"></div>
            </div>
            <div id="center" class="show"></div>
            <div id="right" class="show"></div>
        </div>
    </div>
</body>
</html>